The last thing to collapse is the surface.

It is the theory which decides what we can observe

I never think of the future. It comes soon enough. When visiting the U.S. from Germany for a winter academic stay.

I am not a genius, I am just curious. I ask many questions. and when the answer is simple, then God is answering.

When I study philosophical works I feel I am swallowing something which I don't have in my mouth.

Success = 1 part work + 1 part play + 1 part keep your mouth shut

We come now to the question: what is a priori certain or necessary, respectively in geometry (doctrine of space) or its foundations? Formerly we thought everything; nowadays we think nothing. Already the distance-concept is logically arbitrary; there need be no things that correspond to it, even approximately.